Address flake in testNetworkCallbackMaximum am: 2eb2f7998d am: 23da14cf90

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2730494

Change-Id: I9d86db7ae1e5d2423c5a5fa0b56dd4ed3acf4a42
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>